User blog comment:Hayds126/Why does this game have so much grinding/@comment-30893072-20170703235808/@comment-27248965-20170704022355

Brimber Gym indeed has Pokemon around Lv. 20, and Leader Sebastian's Pokemon were at Lv. 20-22 before receiving a boost in the free access update to become Lv. 22-25. As Tricky said, updates come slow, thus giving plenty of time for you to train.

I'd agree that Fluoruma Gym Leader Fissy's party and also all Pokemon in Frostveil Gym should have their levels decreased, but only by 3 or 4 levels instead of a really significant one. Remember to battle all trainers, do not skip them. Some trainers available for rematches are also very helpful.